Improvement in fire-extinguishers



NI ED STATES PATENT OFFICE.

ISAAC O. ANDREWS AND AMZI S; DODD, OF NEW'YORK, N. Y., ASSIGNORS TO HOMEFIRE-EXTINGUISHER COMPANY, OF SAME PLACE.

IMPROVEMENT IN FlRE-EXTINGUISHERS- Specification forming part of LettersPatent No. 149,629, dated April 14, 1874; application filed January 31,1874.

To all whom it may concern:

Be it known that we, ISAAC O. ANDREWS and AMZI S. DODD, of the city,county, and

State of New York, have invented a new and of the apparatus, takenthrough the line .00 m,

Fig. 1. 7

Similar letters of reference indicate corresponding parts.

Our invention has for its object to improve the construction offire-extinguishers in such a way that the acid-vessel may be securelyheld and readily and surely disengaged to discharge the acid, whichcannot be tampered with without indicating it, which will give warningshould any one attempt to remove the head while the apparatus is underpressure, and which shall be light and at the same time. strong.

The invention'will first be fully described, and then pointed out in theclaims.

A is the alkali-vessel of the apparatus, the body of which is made oflight sheet-copper or other suitable material, securely riveted orotherwise fastened together. The body of the alkali-vessel A is closelywound with wire a, securely soldered together and to the said vessel.This construction gives the strength necessary to resist the outwardpressure of the gas generated when the acid is discharged into thealkali, and at the same time enables the Vessel to be made tight. In themouth of the alkali-vessel A is placed a screw-collar, ta which is madewith a shoulder or .fiange upon its inner end, to rest against the innersurface of the breast of the vessel A, and

which is securely soldered to said breast.

This construction also greatly strengthens the alkali-vessel againstoutward pressure. B is the top, cover, or head, which is provided withhandles 1), in the ordinary manner, and which screws into thescrew-collar a of the alkalivessel A. G is the inner or acid vessel, thebottom of. which has a transverse V-groove formed in it, which receivesthe V-shaped bottom bar d of the bow or U-bar D. To one side of theacid-vessel O, at or near its bottom, is secured one end of a shortchain, E, the other end of which is secured to the bottom bar 61 of thebow D. To the center of the bottom bar 61 of the bow D is attached, orupon it is formed, a rounded projection or knob, F, which enters aconcavity or recess in the'bottom of the acid-vessel O. Thisconstruction enables the acid-vessel C to be readily adjusted in place,and also enables it to tip readily when the stopper is withdrawn. Thehow 1) is strengthened at or near the upper end "of the acid-vessel O bya ring-bar, d", as shown in Figs. 1 and 3, so that the bow D cannotspring while being operated. The arms of the bow D pass up throughstuffing-boxes in the head B, and their upper ends pass through socketsin the ends of the frame or plate G, which is secured adjustably inplace by nuts d screwed upon said arms above and below the said frame G.To the upper side of the head B is secured a vertical standard, H, whichis slotted longitudinally and in line with the arms ofthe bow D, so thatthe frame Gr may pass through and move up and down in the said slot. Inthe frame G is formed a slot or opening, to receive an eccentric, I,which is pivoted to the slotted standard H, in which it works by a pin,to which it is rigidly attached, and to the ends of which, upon theouter sides of the slotted standard H, are rigidly attached the ends ofthe arms of the slotted lever J, so that the said eccentric I can beoperated, by operating the said lever J, to lower and raise the bow D,as required. The mouth of the acid-vessel O is closed with a stopper, K,the body of which may be made of any suitable material, but the lowerend or point of which should be made of metal or other hard substance,for the purpose hereinafter set forth. The stopper K is attached to thecenter of a spring bar or plate, L, the ends of which are secured to thehead B. The spring L prevents the acid-vessel G from being broken whenforcing the stopper K into place, and when handling the apparatus, andalso allows the apparatus to accommodate itself to in g the acid.

variations of temperature without loosening the said stopper K. Themouth of the acidvessel 0 is rabbeted, countersunk, or beveled to form ashoulder, 0, to receive a glass or other plate, M, which is cemented orotherwise secured into place, and which is broken by the hard point ofthe stopper K, as the said stopper is forced into place. This allows theacid-vessel C to be conveniently put into the machine without any dangerof spill- It also allows a number of the acid-vessels to be kept filledand ready for use, so that the empty ones can be readily removed andreplaced with filled ones, as required, and enables the empty vessels tobe refilled when their contents have been used. The lever J may belocked, holding the stopper K in place by a spring key or pin, N, whichis passed through a hole in the said lever J and upper end of theslotted standard H. The springkey N should be attached to the end of ashort chain, O, the other end of which should be attached to the head B,or to some other convenient part of the apparatus. P is a smalleccentric plate pivoted to the lower part of the slotted standard H, andwhich has one or more holes through it, corresponding with holes throughthe said slotted standard, to receive a small pin or pins, Q, to act asa seal, so that, should the lever J be operated to withdraw thestopperK,-the said pin or pins Qmay be broken off by the eccentric I,and the plate 1? allowed to drop, thus calling attention to the factthat the apparatus should be examined. For conveniencein putting in theacid-vessel, a curved bar, It, may be attached to the arms of the bow D,as shown in Figs. 1 and 3. When the bar or plate R is used, thescrew-threads upon the collar a and head B must be so arranged that thesaid bar or plate shall be upon the side of the apparatus opposite tothat to which the carrying-straps are attached, so that the acid-vessel,when the apparatus is carried, will always incline toward the operator,and from the bar or plate It. By this means the acidvessel 0 will alwaysfall when the stopper K is withdrawn. S are chains, the upper ends ofwhich are attached to the end of the lever J, and which pass throughholes in the ends of the handles 1), so that the operator, while havingthe apparatus upon his back, by pulling upon one or the other of thechains S, can withdraw the stopperKand discharge the acid. The bow D hastoes or shoulders (1 formed upon its arms, in such positions that whenthe said bow is forced down by operating the le' ver J the said toes orshoulders (1 may strike against the breast of the acid-vessel G andforce it ofi the stopper K. Across the screwthreads of the collar 01. orof the head B, or of both, is formed a groove, T, as shown in Fig.

such a form as maybe most convenient for the attachment of the hose orother connections.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent 1. The frame G, eccentric I, and lever J, incombination with the standard H, head B, and bow D, for removing thestopper K from the acid-vessel G substantially as herein shown anddescribe 2. The knob or projection F, in combination with the base-bar dof the bow D, and with the recessed bottom of the acid-vessel 0,substantially as herein shown and described.

3. The combination of the spring L with the stopper K of the acid-vessel 0, and with the head B, substantially as herein shown anddescribed.

' 4.. An alkali-vessel provided with head B and collar at, having thenotches T across the screwthreads of one or the other, as and for thepurpose specified.

5. The combination of a frangible plate, M, and a downwardly-projectingconical stopper, K, of an acid-vessel having a'conical or shoulderedneck, as and for the purpose set forth.

6. The seal formed of the perforated eccentric plate I? and pin or pinsQ, in combination with the slotted standard H, substantially as hereinshown and described.

7. The chains S, in combination with the lever J and handles b of thehead B, substantially as herein shown and described.

ISAAC O. ANDREWS. AMZI S. DODD. Witnesses:

O. J. OAFFREY, T. S. 00X.

